Circuit-interrupter for electric ignition systems.



R. WAGNER.

cmcnn" INTERRUPTER FOR ELEGTRIG IGNITION SYSTEMS. 7

APPLICATION FILED JAN.31. 1912,

1 0 5 5 7 PatenIed June 24,1913.

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g by the same distance.

"on'rrnn s'ra'rns P ENT RGBERT WAGNER, OF STUTTGART, GERMANY, ASSIGNORTO THE FIRM OF ROBERT BOSCH, 01F STUTTGART, GERMANY.

CIRCUIT-INTERRUPTER FOR ELECTRIC IGNITION SYSTEMS;

Specification of Letters Patent.

Patented June 24, 1913.

Application filed January 31, 1912. Serial No. 674,601.

To all whom it may concern to it known that I, Roncnr WAGNER, a subjectof the Emperor of Germany, residing at 16 Ludwig Pfaustrasse, Stuttgart,Germany. have invented certain new and useful Improvements inCircuit-Inter rupters for Electric Ignition Systems; and I do herebydeclare the following to be a full, clear. and exact descriptionof theinvention, such as will enable others skilled in the art to which it.appertains to make.

and use the same...

The present invention relates to circuit interrupter-s for electricignition systems for igniting the combustible gases in internalcombustion engines, and more particularly to those intcrruptcrs welladapted for installation on the end of the armature shaft of magnetosand the like, so as to rotate therewith, wherein the coacting contactterminals are periodically separated.

Ileretoforc. the movable contact terminal has usually been mounted on arigid rocking arm, against which a spring continually pressed so as tonormally hold the enacting terminals in contact with each other, or elsethe movable contact terminal was mounted directly upon a spring, thedeflection of which separated the contact terminals. In all cases, sofar as I am aware, the movable contact terminal described substantiallyan arc in interrupting the circuit, so that all portions of thecontacting surfaces did not become separated with equal rapidity and didnot become separated from each other In, consequence of suchconstruction the ever present tendency for an arc to form atthe place ofinterrup- .tion was increased.

The present invention is directed to a construction intended to avoidthese diiiiculties. It accomplishes that purpose by providing means forguiding the movable contact terminal in such manner that the circuitbreaking movement of the contact surface thereof is substantially amovement of parallel translation. V

In the accompanying drawings, illustrating the preferred form of myinvention applied to an interrupter wherein the movable contact terminalis moved substantially in the direction of the axis of rotation of theinterrupter, Figure 1 is a plan view of the interrupter: Fig. 2 is aside view of the interrupter; Figs. 3 and 4; show the spring -is screwedthe stationarycontact E structure and the contacting terminals on anenlarged scale, in closed and open positions respectively.

Upon the disk or support a, which is preferably provided with a boss I)and which can be secured upon the shaft of a magneto armature 7 or othersuitable rotating part, The plate 0 is fastened to and insulated fromthe support (a in the manner shown.- The spring plates F, F aresuperposed and separated from each other at their free ends by the block0 to which they are rigidly fastened. At their other ends they arespaced apartby the block (Z to form a parallelogrannand are anchored tothe insulated plate 0 shown. The movable contact terminal E is fastenedto the separating block a near the outer end of the spring structure.

The support-((- has an axial guide 9 with axially arranged slots,adapted to hold a eylimlrical block 71- of fiber or the like. The block11. projects below the bottom of the support a. and is. adapted to abutagainst the outer end of the spring structure when its lower profiectingend periodically engages a stationary cam 6 or the like. In this way,the outer end of the spring structure and also the movable contact E areperiodically raised against the stress of the spring structure. Inasmuchas the su erposed spring plates F, F are rigidly fastened together attheir ends, the contact surface of the movable terminal E is moved inparallel translation near the place of interruption, in the" mannerindicated in Figs. 3 and 4:;

The interrupter parts may be incased in a casing 5 which carries theactuating cams 6. In order to adjust the period of ignition relativelyto the stroke of the engine, the casing 5 may be turned in its frame 8by the adjusting lever 9, thereby adjusting the period at which therotating block 71. is

periodically moved by the actuating cams 6 to separate the co actingcontact terminals the axis of rotation, it is to be understood that theinvention is in no Wise limited to such application, but on'the contrarymay be applied to various other types of mechanical interrupters.

Having thus described my invention what I claim is:

1. A circuit interrupter forelectric ignition systems comprising asupport, a contact terminal mounted on said support, a relativelymovable co-acting contact terminal, mechanism for periodicallyseparating said contact terminals, and guiding means maintaining thecontact surface of the movable contact terminal parallel with thecontact surface of the other contact terminal in the circuitinterrupting movement.

2. An electric circuit interrupter comprising a support, a contactterminal mounted on said support, a relatively movable coacting contactterminal, mechanism for periodically separating said contact termi nalsin substantially the direct-ion of the axis of the support, and guidingmeans maintaining the contact surface of the movable contact terminalparallel with the contact surface of the other contact terminal in thecircuit interrupting movement.

3. A circuit interrupter for electric ignition systems comprising asupport, a contact terminal mounted on said support, a relativelymovable co-act-ing contact terminal, mechanism for periodicallyseparating said contact terminals, and guiding means comprising aplurality of superposed and separated members rigidly fastened togetherand to, said support at one end, and rigidly fastened together andcarrying the movable terminal near the other end, whereby the accusercontact surface of the movable terminal is guided in a circuitinterrupting movement of substantially parallel translation,

4. A circuit internupter for electric igni tion systems, comprising asupport, a contact terminal mounted on said support, a relativelymovable co-acting contact terminal, mechanism for periodicallyseparating said contact. terminals, and guiding means comprising aplurality of parallel and separated spring plates rigidly fastened together and to saidsupport at one end, and rigidly fastened together andcarrying the movable terminal near the other end, Where by the contactsurface of the movable terminal is guided in a circuit interruptingmovement of substantially parallel translation.

5. A circuit interrupter for electric ignition systems comprising arotatable support, a contact terminal mounted on said support, twoparallel and separated spring plates rigidly fastened togethoirand tothe support at one end, and rigidly fastened together at their outerend, a co-acting contact terminal mounted on said spring plates betweenthe ends thereof, and mechanism for periodically separating saidcontact. terminals in substantially the direction of the axis ofrotation including an axially movable member guided in said support andadapted to lift the outer end of said spring plate when it is axiallyactuated.

In testimony whereof I ailix my signature, in presence of two Witnesses.

ROBERT \VAGNER, lVitnesses:

MAX Ansonu'rz, PAUL VOLFART.

Copies of this patent may be obtained for five cents each, by addressingthe: Commissioner of Patents,

Washington, D. C.

